The study was led by Dr Gerulf Rieger from the Department of Psychology at the University of Essex, in which they analysed 345 women while being shown of naked men and women. Their biological responses were measured, which included their pupil dilation and their genital response (pulse and blood flow).

The results were surprising to say the least, and women who identified as heterosexuals were, on average, strongly aroused by videos of both attractive men and women.

Dr Rieger’s said: “Even though the majority of women identify as straight, our research clearly demonstrates that when it comes to what turns them on, they are either bisexual or gay, but never straight.”